Directly Related Criteria. In contrast to common efficiency criteria, which can
be considered as indicators of energy efficiency , the energy efficiency of a
system itself can be ranked in a reference system . This means its goal is to
optimize the energy consumption in relation to delivered service items. Thus, the
quality criterion Energy Efficiency, belonging to Efficiency in general, is assigned
to the directly related criteria . The Framework Entropy represents the grade of
usage of external libraries and high level constructs. The different types of
applications with their different levels of energy efficiency are indicated by the
criterion Functional Types .